package com.sky.service.impl;

import com.sky.constant.MessageConstant;
import com.sky.dto.GoodsSalesDTO;
import com.sky.entity.Orders;
import com.sky.exception.ReportBusinessException;
import com.sky.mapper.OrderMapper;
import com.sky.mapper.ReportMapper;
import com.sky.mapper.UserMapper;
import com.sky.service.ReportService;
import com.sky.vo.OrderReportVO;
import com.sky.vo.SalesTop10ReportVO;
import com.sky.vo.TurnoverReportVO;
import com.sky.vo.UserReportVO;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDate;
import java.time.LocalDateTime;
import java.time.LocalTime;
import java.time.format.DateTimeFormatter;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

/**
 * 营业额统计业务实现
 */
@Service
@Slf4j
public class ReportServiceImpl implements ReportService {

    @Autowired
    private ReportMapper reportMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private OrderMapper orderMapper;

    @Override
    public TurnoverReportVO turnoverStatistics(LocalDate begin, LocalDate end) {
        // 1. 拼接日期字符串   2022-10-01,2022-10-02,2022-10-03
        // 如果开始时间比结束时间晚，直接报错
        if (begin.isAfter(end)) {
            throw new ReportBusinessException(MessageConstant.REPORT_TIME_OUT_OF_RANGE);
        }
        List<String> dates = new ArrayList<>();
        DateTimeFormatter dateTimeFormatter = DateTimeFormatter.ofPattern("yyyy-MM-dd");
        while (!begin.isAfter(end)) {
            dates.add(dateTimeFormatter.format(begin));
            // 加一天
            begin = begin.plusDays(1L);
        }
        String datesStr = StringUtils.join(dates, ",");
        log.info("营业额统计业务，日期字符串的拼接结果为：{}", datesStr);

        // 2. 拼接每个日期对应的营业额的字符串  406.0,1520.0,75.0
        List<String> turnovers = new ArrayList<>();
        dates.forEach(dateStr -> {
            // 根据每一个日期计算当前的营业额
            Double sum = reportMapper.sumByDate(dateStr);
            turnovers.add(String.valueOf(sum == null ? 0 : sum));
        });
        // 逗号分隔，拼接字符串
        String turnoverStr = StringUtils.join(turnovers, ",");

        // 生成vo
        TurnoverReportVO vo = TurnoverReportVO.builder()
                .dateList(datesStr)
                .turnoverList(turnoverStr)
                .build();


        return vo;
    }

    @Override
    public UserReportVO getUserStatistics(LocalDate begin, LocalDate end) {
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);

        while (!begin.equals(end)) {
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        List<Integer> newUserList = new ArrayList<>(); // 新增用户数
        List<Integer> totalUserList = new ArrayList<>(); // 总用户数

        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            // 新增用户数量 select count(id) from user where create_time > ? and create_time < ?
            Integer newUser = getUserCount(beginTime, endTime);
            // 总用户数量 select count(id) from user where  create_time < ?
            Integer totalUser = getUserCount(null, endTime);

            newUserList.add(newUser);
            totalUserList.add(totalUser);
        }

        return UserReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .newUserList(StringUtils.join(newUserList, ","))
                .totalUserList(StringUtils.join(totalUserList, ","))
                .build();
    }

    /**
     * 根据时间区间统计用户数量
     *
     * @param beginTime
     * @param endTime
     * @return
     */
    public Integer getUserCount(LocalDateTime beginTime, LocalDateTime endTime) {
        Map map = new HashMap();
        map.put("begin", beginTime);
        map.put("end", endTime);
        return userMapper.countByMap(map);
    }

    /**
     * 根据时间区间统计订单数量
     *
     * @param begin
     * @param end
     * @return
     */
    public OrderReportVO getOrderStatistics(LocalDate begin, LocalDate end) {
        List<LocalDate> dateList = new ArrayList<>();
        dateList.add(begin);

        while (!begin.equals(end)) {
            begin = begin.plusDays(1);
            dateList.add(begin);
        }
        // 每天订单总数集合
        List<Integer> orderCountList = new ArrayList<>();
        // 每天有效订单数集合
        List<Integer> validOrderCountList = new ArrayList<>();
        for (LocalDate date : dateList) {
            LocalDateTime beginTime = LocalDateTime.of(date, LocalTime.MIN);
            LocalDateTime endTime = LocalDateTime.of(date, LocalTime.MAX);
            // 查询每天的总订单数 select count(id) from orders where order_time > ? and order_time < ?
            Integer orderCount = getOrderCount(beginTime, endTime, null);

            // 查询每天的有效订单数 select count(id) from orders where order_time > ? and order_time < ? and status = ?
            Integer validOrderCount = getOrderCount(beginTime, endTime, Orders.COMPLETED);

            orderCountList.add(orderCount);
            validOrderCountList.add(validOrderCount);
        }

        // 时间区间内的总订单数
        Integer totalOrderCount = orderCountList.stream().reduce(Integer::sum).get();
        // 时间区间内的总有效订单数
        Integer validOrderCount = validOrderCountList.stream().reduce(Integer::sum).get();
        // 订单完成率
        Double orderCompletionRate = 0.0;
        if (totalOrderCount != 0) {
            orderCompletionRate = validOrderCount.doubleValue() / totalOrderCount;
        }
        return OrderReportVO.builder()
                .dateList(StringUtils.join(dateList, ","))
                .orderCountList(StringUtils.join(orderCountList, ","))
                .validOrderCountList(StringUtils.join(validOrderCountList, ","))
                .totalOrderCount(totalOrderCount)
                .validOrderCount(validOrderCount)
                .orderCompletionRate(orderCompletionRate)
                .build();

    }

    /**
     * 根据时间区间统计指定状态的订单数量
     *
     * @param beginTime
     * @param endTime
     * @param status
     * @return
     */
    private Integer getOrderCount(LocalDateTime beginTime, LocalDateTime endTime, Integer status) {
        Map map = new HashMap();
        map.put("status", status);
        map.put("begin", beginTime);
        map.put("end", endTime);
        return orderMapper.countByMap(map);
    }

    /**
     * 查询指定时间区间内的销量排名top10
     *
     * @param begin
     * @param end
     * @return
     */
    public SalesTop10ReportVO getSalesTop10(LocalDate begin, LocalDate end) {
        LocalDateTime beginTime = LocalDateTime.of(begin, LocalTime.MIN);
        LocalDateTime endTime = LocalDateTime.of(end, LocalTime.MAX);
        List<GoodsSalesDTO> goodsSalesDTOList = orderMapper.getSalesTop10(beginTime, endTime);

        String nameList = StringUtils.join(goodsSalesDTOList.stream().map(GoodsSalesDTO::getName).collect(Collectors.toList()), ",");
        String numberList = StringUtils.join(goodsSalesDTOList.stream().map(GoodsSalesDTO::getNumber).collect(Collectors.toList()), ",");

        return SalesTop10ReportVO.builder()
                .nameList(nameList)
                .numberList(numberList)
                .build();
    }
}
